package cn.zs.groupmarket.domain.activity.service.discount.impl;

import cn.zs.groupmarket.domain.activity.model.valobj.GroupBuyActivityDiscountVO;
import cn.zs.groupmarket.domain.activity.service.discount.AbstractDiscountCalculateService;
import cn.zs.groupmarket.types.common.Constants;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;

/**
 * @Description: 满减优惠计算
 * @Auther: zs
 * @Date: 2025/01/04/15:58
 */
@Service("MJ")
@Slf4j
public class MJCalculateService extends AbstractDiscountCalculateService {
    @Override
    protected BigDecimal doCalculate(BigDecimal originalPrice, GroupBuyActivityDiscountVO.GroupBuyDiscount groupBuyDiscount) {
        log.info("满减策略折扣计算: {}", groupBuyDiscount.getDiscountType().getInfo());

        // 折扣表达式 100，10 满100减10元
        String marketExpr = groupBuyDiscount.getMarketExpr();
        String[] split = marketExpr.split(Constants.SPLIT);
        BigDecimal x = new BigDecimal(split[0].trim());
        BigDecimal y = new BigDecimal(split[1].trim());

        // 不满足最低满减约束，按照原价
        if (originalPrice.compareTo(x) < 0){
            return originalPrice;
        }
        // 折扣价格
        BigDecimal deductionPrice = originalPrice.subtract(y);
        if (deductionPrice.compareTo(BigDecimal.ZERO) < 0){
            return BigDecimal.ZERO;
        }
        return deductionPrice;
    }
}
